This article explores contemporary discourses of deviation in early twentieth-century Colombia. Through analysis of a presidential assassination attempt in 1906, known as the Crime of Barrocolorado, it discusses the social construction of notions of criminality and danger in the light of the history of emotions. The assault on the president triggered a series of commentaries and reactions that revolved around anarchism, medicine, and criminology, topics that are dissected and connected here in search of their emotional components. In this way, the study brings forth the importance of emotions in the construction of social and political ideas in the past.